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MHT CET202121 Sep 2021Evening ShiftPhysicsWave OpticsActual

In Young's experiment, fringes are obtained on a screen placed a distance 75 ~cm from the slits. When the separation between two narrow slits is doubled, then the fringe width is decrease. In order to obtain the initial fringe width, the screen should be moved through.

Options

  1. A150 cm away from the slits
  2. B75 cm towards the slits
  3. C75 cm away from the slits
  4. D150 cm towards the slits

Correct answer

C. 75 cm away from the slits

Step-by-step solution

Fringe width, = D₁ d₁ = D₂ d₂ aligned & d₂ d₁ = D₂ D₁ & 2= D₂ D₁ & D₂=2 D₁=2 75=150 ~cm aligned

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